Exploration on the track structure type selection and key design parameters of city regional railway

Research purposes: In this century, China's accelerated urbanization process has ushered in a new wave of construction of the city track traffic and the city regional railway as the rail transit of urban agglomerations or city circle. With the massive construction of the city regional railway, the main technical issues such as its track structure type selection and key design parameters become urgent to be studied. Research conclusions: (1)Bi-block ballastless track is recommended for city regional railway after a comprehensive comparison between ballasted track and ballastless track and between different ballastless track types. (2)The structure design and construction method of the end beam at the end of track slab are optimized on basis of early research, design, construction and operation experience of bi-block ballastless track applied in high-speed railway, so as to effectively control the concrete crack of continuous track slabs for subgrade and tunnel sections. Thus, bi-block ballastless track with unit track slabs is recommended for subgrade, bridge and tunnel sections of city regional railway. (3) Bi-block ballastless track structure has good reliability, maintainability and economy. (4)The research results can be applied in the rail design of city regional railway.